The livestock sanitary division of the Department of Agriculture and Industries shall distribute anti-hog cholera serum or other approved immunizing agent at a price equal to all cost of the product, storage and distribution thereof to said department to owners of hogs in Alabama for use on commercial or commercial garbage-fed herds of swine in Alabama and to all other owners of hogs in Alabama who are not entitled to free distribution of said serum or other approved immunizing agent under Section 2-15-251; provided, that whenever said serum or other approved immunizing agent is distributed as provided in this section, said serum or any other approved immunizing agent shall be applied for and distributed in the manner provided in Section 2-15-251.